EP2628264B1 - Annulation de brouillage entre une pluralité de signaux dans un système de communication - Google Patents

Annulation de brouillage entre une pluralité de signaux dans un système de communication Download PDF

Info

Publication number
EP2628264B1
EP2628264B1 EP10773591.2A EP10773591A EP2628264B1 EP 2628264 B1 EP2628264 B1 EP 2628264B1 EP 10773591 A EP10773591 A EP 10773591A EP 2628264 B1 EP2628264 B1 EP 2628264B1
Authority
EP
European Patent Office
Prior art keywords
interference
canceling
signals
communication node
phase noise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10773591.2A
Other languages
German (de)
English (en)
Other versions
EP2628264A1 (fr
Inventor
Dan Weinholt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP2628264A1 publication Critical patent/EP2628264A1/fr
Application granted granted Critical
Publication of EP2628264B1 publication Critical patent/EP2628264B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084—Equal gain combining, only phase adjustments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
    • H04J11/004—Interference mitigation or co-ordination of multi-user interference at the receiver using regenerative subtractive interference cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors

Definitions

  • This invention relates generally to a communication node and a method in the communication node.
  • this invention relates to canceling of interference between a plurality of signals in a communication system.
  • a Multiple-Input-Multiple-Output (MIMO) system is a system having more than one input and more than one output, in other words both the transmitter Tx and receiver Rx of a MIMO system have multiple antennas operating over the same bandwidth. This allows a MIMO system to have higher throughput for the same spectrum because of its ability to transmit and receive multiple streams of data simultaneously.
  • a MIMO system with similar count of antennas at both the transmitter and the receiver in a point-to-point (PTP) radio link is able to multiply the system throughput linearly with every additional antenna. For example, a 2x2 MIMO will double the throughput compared to a Single Input Single Output (SISO) system.
  • SISO Single Input Single Output
  • a MIMO system may be a Line Of Sight (LOS) MIMO system or a non-LOS MIMO system.
  • LOS MIMO system a signal travels over the air directly from a transmitter to a receiver in a straight line without passing any obstructions.
  • non-LOS MIMO system a signal passes obstructions when traveling from a transmitter to a receiver.
  • a signal that passes obstacles on its way may be reflected, diffracted, absorbed, scattered etc., which may create multiple signals that will arrive at the receiver at different times, paths and with different signal strength.
  • MIMO systems for PTP radio links differs from non-LOS MIMO systems in that sense that the channels between transmit and receive antennas are close to static.
  • a well known solution is in this case to use a canceling technique similar to what is used in Cross-Polar-Interference-Cancellation (XPIC).
  • XPIC Cross-Polar-Interference-Cancellation
  • all phase tracking may be allocated to the receive side which may be required in case of microwave frequencies where hardware related aspects such as phase noise may be more critical.
  • an XPIC system is an adaptive coupling electronic circuit handling the problem of cross-polarization interference.
  • An XPIC circuit is a circuit between two orthogonal co-frequency channels used to reduce cross-polar interference during adverse propagation conditions.
  • An XPIC system filters a cross-polarization interference signal in order to successfully receive or decode a desired signal.
  • FIG. 1 shows a block diagram of a simplified 2x2 non-LOS MIMO system 100, where 2x2 implies two antennas Tx1, Tx2 101 at the transmitter and two antennas Rx1, Rx2 103 at the receiver.
  • the 2x2 MIMO system 100 equals an XPIC system.
  • the main difference between the MIMO and XPIC is that in an XPIC application the phase difference between the two received signals is not defined, which may result in destructive phases in the addition point after the two adaptive filters 1 and 2 105. Therefore, in this case there may be a limit on the cross signal levels that may not be exceeded. However, in case of LOS-MIMO this phase difference is controlled by the antenna separation and the destructive case is avoided and thereby there is no cross level limitation.
  • the block diagram also comprises a Canceller-Phase Locked Loop (CLR-PLL) 108 and a symbol clock regeneration 110.
  • CLR-PLL Canceller-Phase Locked Loop
  • the phase tracking of differential phase noise may be improved by adding the separate CLR-PLL 108.
  • the regenerated symbol clock is a clock signal which is synchronized with the signals received at the receiver antennas Rx1, Rx2 103.
  • signals i.e. data modulated signals data 1 and data 2
  • the received signals are filtered in the adaptive filter 1 and adaptive filter 2 105.
  • a symbol clock signal i.e. the clock of the input digital data, is also regenerated 110 at the same time as the filtering is performed.
  • all interference between the outputs from the adaptive filters 105 is cancelled 111, i.e. using a summing point and phase rotators.
  • the receiver Rx1 103 the signals from both transmitter antennas Tx1 and Tx2 101 are present and the signal from the second transmitter antenna Tx2 101 should be cancelled.
  • the phase tracking of differential phase noise is improved by running the signals through the CLR-PLL 108.
  • the error feedback generator 112 comprises several functions, such as symbol decision, symbol error detection and modification of symbol errors for filter coefficient update. In other words, it comprises generation of errors from the interference cancelled signals.
  • the dotted box 115 comprises the same components discussed above, adaptive filters 1 and 2 105, CLR-PLL 108, symbol clock regeneration 110, canceller 111 and error feedback generator 112, but they are not repeated for the sake of simplicity.
  • the data output from the non-LOS MIMO system 100 are data 1 and data 2, i.e. the same data as input into the system 100.
  • a problem with the solution shown in figure 1 when used as a 2x2-LOS-MIMO system is the symbol clock generation.
  • the two received signals in each of the receivers 103 usually have equal signal level. It is difficult to control the exact clock timing difference and if no countermeasures are taken it will result in large clock jitter or even lack of clock synchronization.
  • the objective problem is therefore to provide improved interference canceling in a communication network.
  • the objective problem is solved by a method in a communication node for canceling interference between a plurality of signals in a communication system.
  • the communication node receives, at each of a plurality of receiver antennas, a respective signal. Then, a first part of interference between the plurality of received signals is cancelled.
  • the interference cancelled signals and the received signals are filtered before a second part of interference between the filtered signals is cancelled.
  • the objective problem is solved by a communication node for canceling interference between a plurality of signals in a communication system.
  • the communication node comprises a plurality of receiver antennas each being configured to receive a respective signal.
  • the communication node further comprises a canceling unit which is configured to cancel a first part of interference between the plurality of received signals.
  • the communication node comprises a filtering unit configured to filter the interference cancelled signals and the received input signals.
  • the canceling unit is further configured to cancel a second part of interference between the filtered signals.
  • the interference canceling is split into two parts, a first part performed before the adaptive filtering and a second part performed after the adaptive filtering, the interference canceling in a communication network is improved.
  • An advantage of the present solution is the improvement of both the clock regeneration performance while maintaining the differential phase noise suppression performance.
  • Another advantage is that by leaving a part of the addition/interference canceling after the filter, the bandwidth of the CLR-PLL for this part may be high since the filter delay is not comprised in the round trip delay of this loop.
  • the present solution is related to cancellation in radio link systems.
  • the present solution it is related to splitting a "canceling" addition in LOS-MIMO radio link systems by performing one canceling addition before a first adaptive filter and the remaining part after the first adaptive filter.
  • the major part of the canceling is done before the first adaptive filter and a smaller part is done after.
  • the present solution is applicable to radio link communication between nodes.
  • the solution is applicable to communication within a core network as well as a mobile back-haul network.
  • the present solution is related to a radio link communication hop which may be comprised in all kinds of communication networks.
  • FIG. 2 is a simplified illustration of an embodiment of a communication network 200.
  • the communication network 200 is a telecommunication network using wireless and/or wired communication techniques.
  • the communication network 200 may use technologies such as Long Term Evolution (LTE), General Packet Radio Service (GPRS), Enhanced Data rates for Global Evolution (EDGE), etc.
  • LTE Long Term Evolution
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data rates for Global Evolution
  • a user equipment 201 is connected to a radio access network 203 using a wireless communication technology.
  • the radio access network 203 comprises at least one base station 204, such as e.g. a NodeB, eNodeB (eNB) or any other network unit capable to communicate over a radio carrier with the user equipment 201.
  • the user equipment 201 may be any suitable communication device or computational device with communication capabilities capable to communicate with the base station 204 over a radio channel.
  • the user equipment 201 may for instance be, but is not limited to, mobile phone, smart phone, Personal Digital Assistant (PDA), laptop, MP3 player, portable Digital Video Disc (DVD) player, or similar media content devices, digital camera, or even stationary devices such as a Personal Computer (PC) or Television unit (TV).
  • PDA Personal Digital Assistant
  • DVD portable Digital Video Disc
  • a PC may also be connected via a mobile station as the end station of the broadcasted/multicasted media.
  • the user equipment 201 may be referred to as UE in some of the drawings.
  • the communication network 200 further comprises a core network 209 which provides various services to the user equipment 201 who is connected by the radio access network 203.
  • the communication network 200 may comprise a plurality of user equipments 201 and base stations 204.
  • the radio access network 203 comprises at least one radio access network node 210 and the core network 209 comprises at least one core network node 213.
  • the user equipment 201, radio access network node 210, base station 204, and core network node 213 comprise radio interfaces configured to enable transmission and receipt of radio signals to/from each other.
  • FIG. 3 shows a block diagram of a simplified exemplary embodiment of a 2x2 LOS-MIMO radio link system 300 where canceling is performed both before and after an adaptive filter. Detailed example embodiments of the blocks in figure 3 will be described later with reference to figure 4 .
  • the 2x2 LOS-MIMO radio link system 300 is comprised in a communication node.
  • the communication node may be a user equipment 201, a base station 204, a radio access network node 210, or a core network node 213.
  • figure 3 shows only one arrow for input signals, a person skilled in the art, having the 2x2 LOS-MIMO system 300 in mind, will understand that this arrow represents at least two input signals.
  • the interference between the input signals is cancelled using a first interference canceller 301. Then, the interference cancelled signals and received input signals are filtered using adaptive filters 303. After the filtering 303, a second interference canceling 305 is performed. Thus, the interference canceling is split into two steps, one before the filtering 303 and one after the filtering 303. In one embodiment, the largest part of the interference canceling is done before the filtering 303 and the rest of the interference canceling is done after the filtering 303.
  • An error feedback generator 307 performs symbol decision, symbol error detection and modifies symbol errors for a filter coefficient update. In an embodiment where the communication node is e.g.
  • the output data is output to for example the base station 204 in figure 2 , such as e.g. an eNodeB.
  • figure 3 shows only one arrow for output signals, a person skilled in the art, having the 2x2 LOS-MIMO system 300 in mind, will understand that this arrow represents two output signals.
  • the input signals are the same as the output signals.
  • Figure 4 shows one exemplary embodiment of a LOS-MIMO radio link system 400 in more detail.
  • the system 400 is comprised in a communication node.
  • the 2x2 LOS-MIMO radio link system 400 exemplified in Figure 4 comprises two antennas Tx1, Tx2 404 at the transmitter and two antennas Rx1, Rx2 407 at the receiver.
  • the system 400 in figure 4 corresponds to the system 300 shown in figure 3 .
  • figures 3 and 4 illustrate a 2x2 system as an example, a person skilled in the art will understand that this applies equally to any order of LOS-MIMO systems, e.g. 3x3, 4x4 etc.
  • An increase of the order of the LOS-MIMO system requires additional sum points for cancelling of the additional signals.
  • the first transmitter antenna Tx1 404 transmits data 1 to the first receiver antenna Rx1 407 and the second receiver antenna Rx2 407.
  • the second transmitter antenna Tx2 404 transmits data 2 to the first receiver antenna Rx1 407 and the second receiver antenna Rx2 407.
  • the dotted box 409 illustrates that the same handling of the received signals is also performed when received at the second receiver antenna Rx2 407, but is not repeated for the sake of simplicity.
  • the input signal received at the first receiver antenna Rx1 407 is added in a first summing point 411 together with the negative output from a second adaptive filter 413.
  • the output from the second adaptive filter 413 is phase rotated in e.g. a pre-phase rotator 415 and multiplied with a constant, e.g. a constant K 417.
  • the constant K 417 may be for example 0.8. However, the constant K may be any constant from 0 to 1.
  • the addition with the negative output from the second adaptive filter 413 cancels a majority of the interference between the two signals.
  • the summing point 411 and the constant K 417 represents the first interference canceling, and corresponds to box 301 in figure 3 .
  • a symbol clock is regenerated using a symbol clock regenerator 419.
  • the symbol clock regenerator 419 uses the signal after summing point 411 which is also the input to a first adaptive filter 420.
  • the output from the canceling is then filtered in the first adaptive filter 420 together with the received input data.
  • the first and second adaptive filters 413, 420 perform an adaptation so that the part of the signals from the first adaptive filter 420 and the second adaptive filter 413 that shall cancel them self out are identical.
  • the output from the canceling is provided to a unit performing symbol decision, Carrier Recovery Phase Locked Loop (CarrRecPLL) and error calculation, i.e. error feedback generator 421.
  • Data 1 is output from the error feedback generator 421.
  • the error feedback generator 421 further comprises an output in terms of error feedback for the filter update.
  • the first adaptive filter 420 and the second adaptive filter 413 are updated by the error feedback generation 421 so that the Tx2 part of the signal after the first adaptive filter 420 is identical to the fractional part (K*L) of Tx2 from the second adaptive filter 413.
  • the output data is the same as the input data.
  • the output signal from the multiplication with the constant K 417 is also sent through a delay compensation for filter 1 422.
  • the output from the second adaptive filter 413 is added in front of the first adaptive filter 420, i.e. the first summing point 411. Since a second summing point 429 must be aligned with the first summing point 411 to achieve a complete canceling, the second part must be delayed to compensate for the delay in the first adaptive filter 420.
  • the first adaptive filter 420, the second adaptive filter 413 and the delay compensator 422 corresponds to box 303 in figure 3 .
  • the output of the delay compensation for filter 1 422 is multiplied with a constant L 430, which may be e.g. 0.2.
  • the signal multiplied with L 430 is then phase rotated in a post-rotator 431.
  • the post-phase rotator 431 increases the differential phase tracking and thereby the phase noise resistance.
  • the output from the post-rotator 431 is provided with a negative sign and added in the second summing point 429 together with the output from the first adaptive filter 420, i.e. performing a second canceling.
  • the canceling performed after the first adaptive filter 420 may be smaller than the canceling 411 performed before the first adaptive filter 420.
  • the output of the delay compensator for the first adaptive filter 422 is added in a third summing point 432 together with the output from the post-rotator 431. This is convenient in order to get a bandwidth that is independent of the ratio between K 417 and L 430.
  • the output from the post-rotator 431 may be used directly without adding the output from the delay comp 422.
  • the constant L 430, the post-rotator 431 and the summing points 429 and 432 illustrates the second interference canceling and corresponds to box 305 in figure 3 .
  • both the pre-rotator 415 and post-rotator 431 are used to adjust the phase of the output from the second adaptive filter 413 in order to get an accurate cancellation of the signal transmitted from the transmitter antenna Tx2 404 and received in the receiver antenna Rx1 407 by means of the signal transmitted from the transmitter antenna Tx2 404 which is received in the receiver antenna Rx2 407.
  • the output of the third summing point 432 and an output from the error feedback generator 421 are provided to a canceller phase locked loop (CLR-PLL) 434. Since a second part of the interference canceling is done after the filtering, the bandwidth of the CLR-PLL 434 for this part may be high because the filter delay is not comprised in the round trip delay of this loop.
  • the CLR-PLL 434 comprises both loops formed by CLR-PLL 434 + pre-phase rotator 415 + K 417 + summing point 411 + error feedback generator 421 and CLR-PLL 434 + post-rotator 431 + second summing point 429 + error feedback generator 421.
  • the distribution between addition before and after the first adaptive filter 1 420 may be a trade-off between symbol clock regeneration 419 performance and differential phase noise suppression.
  • the input to the delay comp 422 is taken after the constant K 417. In other embodiments, the input may be taken before the constant K 417.
  • the implementation of the "dual" CLR-PLL 434 may vary but the following may be applicable:
  • the control of the post-rotator 431 may be of 1 st order and may have a steady state value of zero.
  • the simplest way to achieve zero as steady state may be to use the actual phase rotation of the post-rotator 431 as the phase error input for control of the pre-rotator 415.
  • the pre-rotator 415 loop may be of 1 st or 2nd order.
  • the two rotators i.e. the pre-rotator 415 and the post-rotator 431 are in parallel, i.e. they both rotate the output from the second adaptive filter 2 413, and it may from a stability point of view not be possible to add the output from two loop integrators.
  • the integrator output of the high bandwidth loop is used as error input to the low bandwidth loop it may be possible to achieve total stability in a simple way.
  • the pre-rotator loop 415 may be of 2nd order which makes it possible to compensate for frequency errors without any performance degradation.
  • FIG. 3 is a flowchart describing the present method in the communication node 201, 204, 210, 213 for canceling interference between a plurality of signals in a communication network 200.
  • the communication node 201, 204, 210, 213 comprises a plurality of receiver antennas 407 each being configured to receive signals from a respective transmitter(s) 404.
  • the communication node 201, 204, 210, 213 may comprise one of a multiple-input multiple-output system, referred to as MIMO, a line-of sight MIMO, referred to as LOS-MIMO and Cross Polarization Interference Canceller, referred to as XPIC.
  • MIMO multiple-input multiple-output system
  • LOS-MIMO line-of sight MIMO
  • XPIC Cross Polarization Interference Canceller
  • the communication node 201, 204, 210, 213 comprises a radio interface and is one of a user equipment 201, base station 204, core network node 213 and radio access network node 210.
  • the method comprises the further steps to be performed in the communication node 201, 204, 210, 213:
  • the communication node 201, 204, 210, 213 receives at each of a plurality of receiver antennas 407, a respective signal.
  • the communication node 201, 204, 210, 213 cancels a first part of interference between the plurality of received signals.
  • the communication node 201, 204, 210, 213 generates a clock signal being synchronized with the received signal. In other words, a symbol clock is regenerated.
  • the communication node 201, 204, 210, 213 filters the interference cancelled signals and the received input signals.
  • the communication node 201, 204, 210, 213 cancels a second part of interference between the filtered signals.
  • the first part interference canceling before the filtering is larger than the second part interference canceling after the filtering.
  • the communication node 201, 204, 210, 213 generates errors from the interference cancelled filtered signals.
  • the communication node 201, 204, 210, 213 comprises a communication node arrangement as shown in Figure 6 .
  • the communication node 201, 204, 210, 213 may comprise one of a multiple-input multiple-output system, referred to as MIMO, a line-of sight MIMO, referred to as LOS-MIMO and Cross Polarization Interference Canceller, referred to as XPIC,
  • MIMO multiple-input multiple-output system
  • LOS-MIMO line-of sight MIMO
  • XPIC Cross Polarization Interference Canceller
  • the communication node 201, 204, 210, 213 comprises a plurality of receiver antennas 407 each being configured to receive a respective signal from a respective transmitter(s) 404.
  • the communication node 201, 204, 210, 213 further comprises a canceling unit 602 configured to cancel a first part of interference between the plurality of received signals.
  • the communication node 201, 204, 210, 213 comprises a filtering unit 603 configured to filter the interference cancelled signals and the received input signals.
  • the canceling unit 602 is further configured to cancel a second part of interference between the filtered signals.
  • the first part interference canceling before the filtering may be larger than the second part interference canceling after the filtering.
  • the communication node 201, 204, 210, 213 further comprises an error generating unit 605 which is configured to generate errors from the interference cancelled filtered signals, and to provide the errors as feedback to the filtering unit 603.
  • the communication node 201, 204, 210, 213 comprises a clock generating unit 607 configured to generate a clock signal being synchronized with the received signal.
  • the communication node 201, 204, 210, 213 comprises a radio interface 608 and is one of a user equipment 201, base station 204, core network node 213 and radio access network node 210.
  • the present mechanism for canceling interference between a plurality of signals in a communication network 200 may be implemented through one or more processors, such as a processor 609 in the communication node 201, 204, 210, 213 depicted in figures 2 , 3 , 4 and 6 , together with computer program code for performing the functions of the present solution.
  • the processor 609 may be for example a Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field-programmable gate array (FPGA), or micro processor.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-programmable gate array
  • the program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the present solution when being loaded into the communication node.
  • One such carrier may be In the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
  • the computer program code may furthermore be provided as pure program code on a server and downloaded to

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Radio Transmission System (AREA)

Claims (8)

  1. Une méthode dans un noeud de communication (201, 204, 210, 213) pour annuler des interférences entre une pluralité de signaux dans un système de communication (200), dans laquelle le système de communication (200) fonctionne dans un environnement à bruit de phase élevé, la méthode comprenant :
    la réception (501), au niveau de chacune d'une pluralité d'antennes de récepteur (407), d'un signal respectif, dans lequel les signaux reçus ont un bruit de phase différentiel entre eux de sorte que le système de communication (200) est dégradé par le bruit de phase différentiel ;
    l'annulation (502) d'une première partie d'interférences entre la pluralité de signaux reçus avant une production de signal d'horloge, réduisant un effet de différence de synchronisation d'horloge associé aux signaux reçus ; caractérisée en ce que
    après l'annulation de la première partie des interférences, la production (503) d'un signal d'horloge qui est synchronisé avec les signaux reçus ;
    le filtrage (504) des signaux à interférences annulées et des signaux reçus ; et
    l'annulation (505) d'une seconde partie d'interférences entre les signaux filtrés, laquelle annulation (505) de la seconde partie d'interférences est retardée pour compenser un retard dans l'annulation (502) de la première partie d'interférences, et laquelle annulation (505) de la seconde partie d'interférences comprend la rotation de phase des signaux filtrés pour augmenter le suivi de bruit de phase différentiel et la suppression du bruit de phase différentiel ; et dans laquelle l'annulation de la première partie d'interférences avant le filtrage est plus grande que l'annulation de la seconde partie d'interférences après le filtrage.
  2. La méthode selon la revendication 1, comprenant en outre :
    la production (506) d'erreurs à partir des signaux filtrés à interférences annulées,
    la fourniture (507) des erreurs comme rétroaction au filtrage (504).
  3. La méthode selon n'importe laquelle des revendications 1 à 2, dans laquelle le noeud de communication (201, 204, 210, 213) comprend l'un d'un système à sorties multiples entrées multiples, mentionné en tant que MIMO, une visibilité directe MIMO, mentionnée en tant que LOS-MIMO et un dispositif d'annulation d'interférences de polarisation croisée, mentionné en tant que XPIC.
  4. La méthode selon n'importe laquelle des revendications 1 à 3, dans laquelle le noeud de communication (201, 204, 210, 213) comprend une interface radio et est l'un d'un équipement d'utilisateur (201), d'une station de base (204), d'un noeud de réseau d'infrastructure (213) et d'un noeud de réseau d'accès radio (210).
  5. Un noeud de communication (201, 204, 210, 213) pour annuler des interférences entre une pluralité de signaux dans un système de communication (200), dans lequel le système de communication (200) fonctionne dans un environnement à bruit de phase élevé, le noeud de communication (201, 204, 210, 213) comprenant :
    une pluralité d'antennes de récepteur (407) chacune étant configurée pour recevoir un signal respectif, dans lequel les signaux reçus ont un bruit de phase différentiel entre eux de sorte que le système de communication (200) est dégradé par le bruit de phase différentiel,
    une unité d'annulation (602) configurée pour annuler une première partie d'interférences entre la pluralité de signaux reçus avant une production de signal d'horloge, réduisant un effet de différence de synchronisation d'horloge associé aux signaux reçus ; caractérisé par
    une unité de production d'horloge (607) configurée pour produire un signal d'horloge qui est synchronisé avec le signal reçu après annulation de la première partie des interférences ; et
    une unité de filtrage (603) configurée pour filtrer les signaux à interférences annulées et les signaux d'entrée reçus ; et dans lequel
    l'unité d'annulation (602) est en outre configurée pour annuler une seconde partie d'interférences entre les signaux filtrés, laquelle annulation de la seconde partie d'interférences est retardée pour compenser un retard dans l'annulation de la première partie d'interférences, et laquelle annulation de la seconde partie d'interférences comprend la rotation de phase des signaux filtrés pour augmenter le suivi de bruit de phase différentiel et la suppression du bruit de phase différentiel, dans lequel l'annulation de la première partie d'interférences avant le filtrage est plus grande que l'annulation de la seconde partie d'interférences après le filtrage.
  6. Le noeud de communication (201, 204, 210, 213) selon la revendication 5, comprenant en outre :
    une unité de production d'erreurs (605) configurée pour produire des erreurs à partir des signaux filtrés à interférences annulées, et pour fournir les erreurs comme rétroaction à l'unité de filtrage (603).
  7. Le noeud de communication (201, 204, 210, 213) selon n'importe laquelle des revendications 5 à 6, dans lequel le noeud de communication (201, 204, 210, 213) comprend l'un d'un système à sorties multiples entrées multiples, mentionné en tant que MIMO, une visibilité directe MIMO, mentionnée en tant que LOS-MIMO et un dispositif d'annulation d'interférences de polarisation croisée, mentionné en tant que XPIC.
  8. Le noeud de communication (201, 204, 210, 213) selon n'importe laquelle des revendications 5 à 7, dans lequel le noeud de communication (201, 204, 210, 213) comprend une interface radio et est l'un d'un équipement d'utilisateur (201), d'une station de base (204), d'un noeud de réseau d'infrastructure (213) et d'un noeud de réseau d'accès radio (210).
EP10773591.2A 2010-10-11 2010-10-11 Annulation de brouillage entre une pluralité de signaux dans un système de communication Not-in-force EP2628264B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/065185 WO2012048723A1 (fr) 2010-10-11 2010-10-11 Annulation de brouillage entre une pluralité de signaux dans un système de communication

Publications (2)

Publication Number Publication Date
EP2628264A1 EP2628264A1 (fr) 2013-08-21
EP2628264B1 true EP2628264B1 (fr) 2015-01-07

Family

ID=44170058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10773591.2A Not-in-force EP2628264B1 (fr) 2010-10-11 2010-10-11 Annulation de brouillage entre une pluralité de signaux dans un système de communication

Country Status (3)

Country Link
US (1) US8897404B2 (fr)
EP (1) EP2628264B1 (fr)
WO (1) WO2012048723A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013044949A1 (fr) * 2011-09-28 2013-04-04 Telefonaktiebolaget L M Ericsson (Publ) Émetteur ayant un signal intégré de suivi de phase différentielle à amplitude zéro, ainsi que récepteur correspondant
CN103828260B (zh) 2011-09-28 2017-02-01 瑞典爱立信有限公司 计算差分相位的估计的方法和分集接收机
US9118413B2 (en) * 2012-12-20 2015-08-25 Nokia Technologies Oy Apparatus and a method
EP2965441B1 (fr) 2013-03-04 2022-10-05 Telefonaktiebolaget LM Ericsson (publ) Outil pour vérifier une zone de visibilité directe dans un système mimo
KR102410157B1 (ko) * 2016-03-17 2022-06-17 한국전자통신연구원 Los 환경에서 mimo 사용하여 전송량 증대가 가능한 무선 통신 장치 및 그 방법
EP3849594A2 (fr) 2018-09-13 2021-07-21 Modernatx, Inc. Polynucléotides codant pour les sous-unités e1-alpha, e1-beta et e2 du complexe alpha-cétoacide déshydrogénase à chaîne ramifiée pour le traitement de la leucinose
WO2020069169A1 (fr) 2018-09-27 2020-04-02 Modernatx, Inc. Polynucléotides codant pour l'arginase 1 pour le traitement d'une déficience en arginase
IT201900002907A1 (it) * 2019-02-28 2020-08-28 St Microelectronics Srl Circuito ricevitore rf con cancellazione di interferenza, sistema, sistema di sensori radar, veicolo e procedimento corrispondenti
US12021309B2 (en) * 2021-08-09 2024-06-25 Hughes Network Systems, Llc Simultaneous multi-polarization receiving with cross-polarization interference cancellation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4138424B2 (ja) * 2002-09-25 2008-08-27 セイコーエプソン株式会社 クロック変換器およびそのクロック変換器を備えた電子機器
JP4306458B2 (ja) * 2003-03-20 2009-08-05 セイコーエプソン株式会社 電圧制御型発振器、クロック変換器及び電子機器
JP4440603B2 (ja) * 2003-11-06 2010-03-24 アルプス電気株式会社 容量検出回路及び検出方法並びにそれを用いた指紋センサ
JP2006071579A (ja) * 2004-09-06 2006-03-16 Alps Electric Co Ltd 容量検出回路及び容量検出方法
US7345528B2 (en) * 2005-05-10 2008-03-18 Texas Instruments Incorporated Method and apparatus for improved clock preamplifier with low jitter
US20080062312A1 (en) * 2006-09-13 2008-03-13 Jiliang Song Methods and Devices of Using a 26 MHz Clock to Encode Videos
US20080062311A1 (en) * 2006-09-13 2008-03-13 Jiliang Song Methods and Devices to Use Two Different Clocks in a Television Digital Encoder
EP2219310A4 (fr) * 2007-11-30 2014-02-19 Nec Corp Système de communication sans fil, récepteur, émetteur, procédé de communication sans fil, procédé de réception et procédé d'émission
EP2235921A2 (fr) * 2008-01-22 2010-10-06 Provigent Ltd. Mise en forme de faisceaux dans des systèmes de communication mimo

Also Published As

Publication number Publication date
US20130216012A1 (en) 2013-08-22
EP2628264A1 (fr) 2013-08-21
WO2012048723A1 (fr) 2012-04-19
US8897404B2 (en) 2014-11-25

Similar Documents

Publication Publication Date Title
EP2628264B1 (fr) Annulation de brouillage entre une pluralité de signaux dans un système de communication
Nwankwo et al. A survey of self-interference management techniques for single frequency full duplex systems
Heino et al. Recent advances in antenna design and interference cancellation algorithms for in-band full duplex relays
EP3140918B1 (fr) Architecture mimo massive
US8787478B2 (en) Wireless communication system, receiving apparatus, transmitting apparatus, wireless communication method, receiving method, and transmitting method
US10523283B2 (en) LOS-MIMO demodulation apparatus, communication apparatus, LOS-MIMO transmission system, LOS-MIMO demodulation method and program
TW201347448A (zh) 適用於幾何閉環視線（los）多輸入多輸出（mimo）之通訊裝置及操作通訊設備之方法
Chang et al. Orthogonal wavefront-multiplexing architecture for communications in non-contiguous channels
KR102162702B1 (ko) 무선 통신 시스템에서 채널 추정 방법 및 장치
EP2761779B1 (fr) Suivi de phase différentielle en présence d'interférences inconnues
Chen et al. Phase noise effect on MIMO‐OFDM systems with common and independent oscillators
Ghanem et al. Codebook based two-time scale resource allocation design for IRS-assisted eMBB-URLLC systems
US7130605B2 (en) Method and device for synchronization and cancellation of a plurality on interfering signals in radio transmission with frequency reuse
Ingason et al. Impact of frequency selective channels on a line-of-sight MIMO microwave radio link
Paul et al. Comparative study of Channel Estimation Algorithms under different channel scenario
Giridhar et al. Adaptive space-time equalization with spatial oversampling for misaligned LoS MIMO
Shao Baseband Self-Interference Cancellation in Fullduplex Massive-Mimo Communication Systems
Rajesh et al. Literature Survey for MIMO Systems and Interference Cancellation in MIMO
Wu et al. Novel Cancellation Techniques and Throughput Analysis for 6G Full-Duplex Wireless System
Na et al. A self interference nulling filter using effective channel information for full duplex systems
EP4430755A1 (fr) Récepteur à annulation successive d'interférences pour récepteurs à entrées et sorties multiples et à visibilité directe
WO2022117193A1 (fr) Estimation de canal à entrées multiples et sorties multiples (mimo)
González et al. Interference leakage minimization for convolutive MIMO interference channels
RU2772115C2 (ru) Использование межсотового прироста за счет мультиплексирования в беспроводных сотовых системах
De Kerret et al. A practical precoding scheme for multicell MIMO channels with partial user's data sharing

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20130408

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20140820

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 706374

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150215

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602010021659

Country of ref document: DE

Effective date: 20150226

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20150107

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 706374

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150107

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150407

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150407

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150408

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150507

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602010021659

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20151008

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602010021659

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20151011

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151031

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160503

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20160630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20151011

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20101011

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150107

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20201027

Year of fee payment: 11

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20211011

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211011